89 
The margin of the arm presents only a single row of marginals 
(identified as inframarginal in this genus); each bears two spines, 
long and white, which are differently arranged on alternate plates. 
One series of plates bears a spine close to the upper (abactinal) margin, 
and a second one of nearly the same length about half-way down the 
lateral face; on the alternate plates, however, the upper spine arises 
at a spot about one-quarter of the height of the plate, and the second, 
which is shorter, near the lower (actinal) margin. So that, looked at 
lengthwise, the arm has four rows of spines; they are fine-pointed, 
circular in section, the upper ones being slightly larger than the 
other, and measure 4 mm.—.e., they are nearly as long as the width 
of the arm. The species appears to be characterized by this alternate 
arrangement of the spines. 
In addition, the marginals bear numerous very short delicate 
spinules in two vertical rows before and behind the large spines : 
they are covered by a pale reddish-brown skin. I see no pedicel- 
larie. The adambulacrals carry two spines: one short, geniculate, 
springs from within the groove, and a larger one from the actinal 
surface, about 2mm. in length, or half that of the marginal spines. 
From around its base spring a few short spmes as on the marginals. 
There is thus a resemblance to L. longispina Sladen (p. 254). 
Odontaster grayi Bell. 
Calliderma grayi Bell, P.Z.S., 1881, p. 95. 
Gnasthaster grayt Sladen, “ Challenger’ Report, xxx, 1889, p. 750. 
Odontaster grayi Bell, P.Z.S., 1893, p. 261; Ludwig, Zeit. f. Wiss. 
Zool., Ixxxii, 1905, p. 44. 
A single individual was obtained. Unfortunately, no station- 
number was attached when it reached me, but I suspect it was ob- 
tained off the coast of Otago. The colour is uniform pale-brown. 
In size it is just double that described by Bell in 1881, having R. 30, 
r. 16; and the ratio is therefore—r. : R. = 1 : 1°87. 
In form it is more distinctly a five-rayed star than Bell’s figure, 
and resembles Ludwig’s figure of O. penicillatus [29, pl. v, fig. 4]; 
but in the two specific characters on which Ludwig lays stress—viz., 
(1) the proportion of R. to r., and (2) the number of marginals—my 
specimen agrees with O. grayz. There are ten supramarginals on each 
side of the arm, the terminals being quite small; so that, with the 
interbrachial, there are twenty-one from tip to tip of the neighbouring 
arms. Most of the granules on these plates have been rubbed off, 
so the condition of those along the contiguous edges of the plates 
is not satisfactorily determinable; but the few that remain allow 
one to recognise that the suture would be readily seen—a feature 
which, according to Ludwig, is more or less characteristic of O. »venicil- 
latus, though he lays less stress on this character than on the two 
referred to above. 
